Annular Cutter Shank Compatibility: Weldon, Bayonet and Adapters

Identify the holder on the actual machine

Look up the machine model and its listed cutter mounting. Hougen’s comparison chart separates bayonet mounting from 3/4 inch double-flat mounting. Milwaukee’s referenced cutter specifies a 3/4 inch Weldon shank. These labels are useful starting points, but they are not an instruction to mix every item carrying a similar number.

If buying a used machine, ask whether the original holder has been changed. Photograph the installed holder and identify any adapter by part number. A listing for the original drill does not necessarily describe a modified unit.

Confirm retention and the pilot

Ask the tooling supplier to confirm how the selected cutter is retained in your holder. For quick-change systems, use the specified cutter family or an explicitly approved adapter. Do not infer compatibility because a cutter can be physically inserted partway into a socket.

Include the pilot or ejector pin in the check. Its specification must match the cutter and machine arrangement. Buying a visually similar pin because it is inexpensive can leave the finished system unresolved; request the actual part number instead.

Check the whole assembly

Measure the usable envelope with the proposed cutter and adapter, not only the bare machine. Ask whether the assembly preserves required coolant delivery and whether the machine can complete the permitted cut within its travel and clearance. An adapter that solves one interface does not automatically solve the rest.

Do not use a generic drill chuck as a universal annular-cutter holder. Hougen lists specific spindle adapters for particular accessory uses. That model-specific approach is the useful rule: find the documented combination rather than constructing one from matching-looking parts.

• Machine model and installed holder identified.
• Exact cutter family, diameter and depth confirmed.
• Matching pin and any approved adapter listed.
• Clearance and coolant requirements checked.

Build a repeatable shopping record

Keep a short tooling record with machine number, holder number, cutter number and pin number. Add the approved source document and the intended material. This makes repeat purchases easier and helps someone else avoid buying the wrong family when replacing a worn cutter.

If a supplier cannot confirm a combination, leave compatibility unknown. A recommendation tool should filter that item out of a definite-match result until evidence is available. The correct outcome may be a manufacturer inquiry rather than another purchase.